Thunder Faith is an interesting character. When originally making FSHE, I didn't actually have a boss for Day 1, only the basic barrier clouds, electric clouds and thunder clouds. Eventually I made the Copy Clouds, and wayyyy later, I'd come up with the Idea for T. Faith. A bunch of Copy Clouds that merged together and tripled their power. In older builds, this was actually a little cutscene! But I eventually decided to make them their own unique character, being a minor deity that's as old as time, only recently learning how to change their form from an electric ball, to something else.